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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575a42a4ba29aa7a978eea3490c28c0c0aed0c322e79f623aef40fac6437f972' 
  AND token = '/mT+B+hoGluXyaJ193//+N2XfFBJwEUqWI58jXXtr4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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