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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7eb8e2307a1c2c62c5ea70b3808f0c98b619fe1e61bf85bf100e5fc9cfb9d1e' 
  AND token = 'FmNBxQyFtXaVMzGEtDgEp+u0o7MDiIVanHBaovS6ulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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