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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42304b92af51653aa4996c1739e31feaf3424aa14ef6d29be19e5db88d7a3ce0' 
  AND token = 'bgZMP9KTeWWiCSi+lIdntyuVRDzYZAFq4w5ReKyDXgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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