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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c90cfbb6ac9af1d51c4b0b2b8573f9ee12f704111014251f1a4bf1981f185e34' 
  AND token = 'SuGQG3Fhkx2iVWFxarRHTOgSGSnz+/vx+3XNk7qNrWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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