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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfe07a3c797ee14d2321a318946ec8f406b0e77fd616fb4ee01bff886a36c08' 
  AND token = 'nMSUXl4fQlqeQ1Jmzr29pFKYUn+ReyEQ+6A8dF5Mz1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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