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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99120cfaa47cf2e10e80b5fa683b28753a0396e01cd14ddc9c7b34c0859f4db8' 
  AND token = 'iGLaOgLOxLkLMmXegANAKJvysmVnm7u4qm36kG56u5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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