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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57514955435c53253a1f2f15d432d0f9cb5a1c43bcb20afc63717faf609a455a' 
  AND token = 'Aa5BvnT4rUSkt+WvCuiNRL+fRrMP+skJu34lXfkfcTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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