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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1125a420ff601a857ae759c8c116c370d83bf5b031334f7172ba9bbdb6615a0a' 
  AND token = 'UN6crwA99TaOHogqccUkzzcYN8loRH3rrM4d1GdR4rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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