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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b0c8536acc6ec86d12e5aa021fae77f591e9fe57d3f4165fe69d9dfb03cfa67' 
  AND token = 'yPMQidddLiOjx6rrCMli2DNLnjctDXPXsHhv95sFjMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}