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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d34f8607d061ef65eff67801ad5dd511eea54ca4e2515cc34c71286af3e93d' 
  AND token = 'Gz7WXi6OSgiuqh/KixO5Ew1norL836UtCJNjspTYRTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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