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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d154a89746b5214d0788f7a3bedeb2a65fa765950fce8c36465f6cfc11b247' 
  AND token = 'B2Zq1JQrR0R1tE53bbayzUJ0iHfFKF3j4XRHe52MIuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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