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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74feab94118a48dd1a2ad21be14e0bcc0d2152a2e914a38926a799d1873469b' 
  AND token = 'uW/PlflBcnUkzMfSwsg/Roh/6TrMwc85Yff6y9U3oxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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