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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4a110376cffbed1f6f95d2ec6cb050cfbbfe79c68f6c2f51eaf91182e8d114' 
  AND token = 'oIyFIFHX8pnCzl/IZ2Pzk05ZI2mxrVbcYTjy7ZADqCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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