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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b09a82963e79d3a2b0753d56ae29232e5ed63a5aafe93aae2dcdb9aa218c7f' 
  AND token = '+ECRDcWKF/G5S7EJHyaROQqB+GDC84tFLb0Aj1E59qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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