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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8108cd0b721daf3b427b78fded1ecdcc35d14386356db8a1b5b48e6904a59bd4' 
  AND token = 'rF8N1ZfAmQyop219ebPh20VIfuK96zIr4iNkhpFxUmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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