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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90bffe9be36cb8a46120ef3da8be80440e2be8dc0761da71643eff6aea759ca' 
  AND token = 'Armv0VWC3hkxjCZS2z03wnSOLWt95w0pSXkez/w2orI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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