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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '579e011619b1daae270de8d0431ddb051e56d8a7a848d6a6d636b9ed44185782' 
  AND token = 'GYv6nmXEwXYQAW96m/H48fnuRPhLdGZFACza91tptG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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