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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ee983aaf4217e352657a7e0c58b9b65992386fa353334c1700299cd456258e' 
  AND token = 'LTYkOmJW6WRuQNec4G3r3SRBFdra/z8hKgK1awrrd98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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