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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3258659e77dda73b372145c99ca0364ba62d2f1e7f5918dabdb71aa5bf9e2e' 
  AND token = 'FgAybL9NY9XCvLJXQ3ShPy31vvAKbJ0qdlEqSxkIwLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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