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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a08a805ef052f1db1ed92c2673d14a4d7a49ab59fc93c70c0bdef031142b4d' 
  AND token = '924EQ7nN1aKk9EOby6+D3ydGLhLszWTojzav7GhQz50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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