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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b07630c4d81f561b0b46c2f730e4afe09176a1d47d7a1d814288aeb8a052daba' 
  AND token = 'ZXzmwMlvrrofCcsOfrPtoMPDih8LOA8BOcnniKkAzrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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