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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97fca5f0f2e2a4c629c816ec3e06132e522a3333e671deffe077ef389dce690c' 
  AND token = 'CMmub+FE59dPTsqLjgVccZumQ9qmysgCG/1REZ3/kjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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