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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d5842c746d5f5e20725263e70daeb803cb34288ba7ffbc4e39a4764c1093f5' 
  AND token = '1L4cKIAel9ld5hF2BiWhp7eXbpqFOgwX5uKC0+A6798=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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