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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84101cbdb6c30bb12b70e10745b21be50e3f33a141b5d39d0e5a96938b7bff3' 
  AND token = '0JrAG1H20U5MJZXLN0nodE3BQy81+t/gG221Y5AXF2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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