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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd65bc631341b90603d43020d048c6e77394497a9bcc4474793eab35a6fcd2a' 
  AND token = 'AN4g5naTsq1OiGSn1eguP8l48jl21h9aKR9j2wE2cdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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