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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c73bed3d4a1a8174fd8d012624f8e578730aa84ea74b01be61d5292e0580eb' 
  AND token = 'Q16BUwc9a75vWHX574C6xFXJElKlCZqFTdMu0Bhqezk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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