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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca98a364efda8fadcdbb1c43d4cbe8e720069cc8be9b1da7c0f462825cf58d0b' 
  AND token = 'KUw5B9hYDS12xr0My4EVK7GOeSznIlDLPWUtYJmGO9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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